Simply use the following example to setup the router to get date time from a NTP server and show the current time according to the timezone and DST settings.
The below example configures a NTP server, then sets the time zone for GMT+10 and sets the DST time frames.
Router(config)#ntp server x.x.x.x
Router(config)#clock timezone AEST 10 0
Router(config)#clock summer-time AEDT recurring 1 Sun Oct 2:00 1 Sun Apr 3:00